Table 2.

Overview of the articles included.

Study nr.	Author	Sample size (n,n,n)	OKAN		Optokinetic stimulation		Condition
			TC (s) + SD of control	TC (s) + SD of patients	Velocity (°/s)	Duration (s)
1	Zasorin et al. (1983) (17)	aT: 35 P: 15 C: 20	23.7 ± 23.1	7.8 ± 11.4	60	60	Bilateral hyporeflexia
2	Jell et al. (1988) (18)	T: 25 P: 11 C: 14	48.8 ± 26.7	95.3 ± 166.12	40	60	Mixed
3	Brantberg and Magnusson (1990) (16)	T: 44 P: 20 C: 24	24.7 ± 16.4	13.5 ± 11.3	90	60	Unilateral acoustic neurinoma
4	Brantberg and Magnusson (1991) (15)	T: 64 P: 14 C: 50	27.6 ± 21.6	21.1 ± 15.4	90	60	Unilateral vestibular neuritis
5	Hain and Zee (1991) (19)	T: 38 P: 8 C: 30	12 ± 7.4	3.7 ± 1.0	60	87	Aminoglycoside induced bilateral vestibulopathy
6	Hain et al. (1992) (20)	T: 43 P: 13 C: 30	11.3 ± 3.2	7.2 ± 1.8	60	87	Unilateral surgical section of the vestibular nerve (due to acoustic neurinoma surgery)
7	Dellepiane et al. (2006) (21)	T: 40 P: 20 C: 20	9 ± 6.2	1.7 ± 1.9	30	87	Bilateral hyporeflexia

^aT, total number of subjects; P, number of patients; C, number of controls. TC, time constant.